I have downloaded your code and your supplied input. I have run the code against the input with the command line ./11132953.pl gi1_3 ge-1/1/1 and I have to report that BIZDSLIP_HSIHYP_NOBP_96KBMG appears nowhere in the output at all. But that isn't surprising because it doesn't appear in the input either.

Can you explain where you think this string should come from? Thanks.

BTW, when running your code the screen just fills with Use of uninitialized value ... warnings which makes spotting a real problem so much more difficult. It would help your cause to try to remove these.